6 Pack - Ink Refill Blue Medium Schmidt P900 Parker Style Ballpoint Refill Medium Tip - Blue Ink - Standard Parker Style ball point refill by Schmidt. Fits all types of pens that accept standard Parker style Ball Point refills. Refill Reads: SCHMIDT Refill P 900 M Length: 3 7/8 inch (9.8cm), Diameter - .230 inch (0.58cm) Made in Germany